I don't see how exactly a syringe absolutely makes something out of date. It's more to do with aesthetics than technology, I don't see it as anymore out of date than AT-AT's having legs when in the SW Universe you have the ability to hover or fly. It's like the hairstyles in ANH, they have nothing to do with technology. Sideburns were popular in the seventies but they were not in the 40s or 50s, which could represent the prequels era, if you understand what I mean.

Wow! What an amazing trailer! I wish I could see even more! What are the chances of me having a DVD copy of this entire movie by next summer? I really want one!